I washed myself: The washing is to remove ritual defilement after touching a dead body (see Num 19.11-13). Good News Translation makes this clear with “so as to purify myself.”

Ate my food in sorrow may be rendered “ate the festival meal, but I was very sad” (Contemporary English Version).

Quoted with permission from Bullard, Roger A. and Hatton, Howard A. A Handbook on Tobit. (UBS Helps for Translators). New York: UBS, 2001. For this and other handbooks for translators see here.